No doubt you have a very bad case of "yeast" infection. Yeast will grow on the outside skin same as it does inside the vagina. A white discharge goes along with yeast infections as well as smelling bad.

Ointments like A&D will trap moisture next to the skin. Yeast loves warmth and moisture.

Use a hair dryer to help keep area dry. Wear only cotton underwear and loose cotton clothing so air can reach the area.